作　　者： ; ; ; ; ;

机构地区： 深圳大学材料学院深圳市特种功能材料重点实验室

出　　处： 《深圳大学学报（理工版）》 2007年第2期166-171,共6页

摘　　要： 采用二次热压法制备Gr质量分数为10％～25％的Gr／Al—0．7Si-1．2Mg复合材料，研究了制备工艺对组织结构及其摩擦磨损性能的影响．结果表明，采用较快速率升温的热压法可有效防止石墨铝复合材料制备过程的有害界面反应，得到组织均匀且致密的石墨铝基复合材料．Gr／Al—0．7Si-1．2Mg复合材料的摩擦系数随载荷的增大而降低，在较大载荷时，可形成完整的石墨润滑膜，不同石墨含量的复合材料的磨擦系数趋于一致，达到0．17．石墨含量高的复合材料容易形成润滑层，所以摩擦系数在较低载荷下就能达到最小值．复合材料相对密度对磨损率的影响较大，接近理论密度的复合材料在本研究试验条件下能保持较低的磨损率。最低可达到0．5×10^-3～2．1×10^-3mm^3／m． Gr（10 -25）%/Al-0.7Si-1.2Mg composites were prepared by a twice hot pressing process under rapid heating conditions. The friction coefficient and wear rate of the materials were studied related to the different normal loading and reinforcement particle content. It is showed that this process can avoid harmful interracial reactions and ensure the composites with uniform microstructure and high relative densities. With increasing normal loading, the friction coefficients of Gr（ 10 -25 ）%/Al-0. 7Si-1.2Mg composites drop rapidly at the beginning and then decrease slowly to 0. 17 due to the formation of a stable graphite lubrication film at relatively high loading. The friction coefficient of composites with relatively high graphite content can reach the minimum value at lower normal loading because the abundant graphite facilitates the formation of the graphite lubrication film. The relative density of the composites is the main factor of influencing the wear rate. The composites with high density can remain relatively low wear rate of （0. 5 -2. 1 ） × 10^-3 mm^3/m under the experimental conditions.

关 键 词： 复合材料 二次热压 摩擦系数 磨损率 石墨润滑膜

领　　域： [金属学及工艺] [金属学及工艺] [金属学及工艺]